Bug 945222 - Update web-platform-tests to revision a3d9d8ef2bd878cb710a2f845258be4a40da2cc1

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rename : testing/web-platform/tests/battery-status/battery-created.html => testing/web-platform/tests/battery-status/battery-created-manual.html
rename : testing/web-platform/tests/battery-status/battery-full.html => testing/web-platform/tests/battery-status/battery-full-manual.html
Make sure that the reporting callback runs last.